Synthetic nanocomposite ceramics - tailored alternative materials of high-pressure minerals

合成纳米复合陶瓷——高压矿物的定制替代材料

• 批准号: 324039096
• 负责人: Professorin Dr. Astrid Holzheid
• 金额: --
• 依托单位: Deutsches Elektronen-Synchrotron (DESY)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/324039096?language=en
• 关键词: Synthetic; nanocomposite; ceramics; tailored; alternative

State-of-the-art high pressure technologies allow synthesizing nano-polycrystalline materials, e.g., ceramics, with excellent mechanical properties, as for instance high hardness and high fracture toughness, from Earth s high abundant geomaterials. The positive correlation of grain fining and hardness of many ceramics, metals and diamond is known as the Hall-Petch relation. This is also evident from stishovite, which is a high pressure polymorph of SiO2 and known as the hardest oxide. Nano-polycrystalline stishovite is seven times tougher than single crystal stishovite. This point towards that grain fining not only can enhance material hardness, but also the fracture toughness. Thus, nano-polycrystalline geomaterials have high potential to substitute economical critical metal raw materials that are essential for the production of common materials with enhanced mechanical properties. In particular, nano-polycrystalline geomaterials are very promising in creating materials that combine high hardness and high fracture toughness, which is a great challenge of material science so far. The aim of the proposed project is a state-of-the-art high pressure-high temperature technology synthesis of economical non-critical materials with excellent mechanical properties made out of nano-polycrystalline geomaterial composites with controlled textures. Nano-polycrystalline aggregates of corundum (Al2O3) and stishovite (SiO2) with variable molar Al2O3:SiO2 proportions from Al2O3-SiO2 glasses as well as nano-polycrystalline aggregates of periclase (MgO) and corundum from MgAl2O4 glass and nano-polycrystalline aggregates of jadeite (NaAlSi2O6) and SiO2-high pressure minerals stishovite and coesite, respectively, from NaAlSi3O8 glass are planned to be synthesized. Another important objective of this systematic experimental approach is to better understand fundamental mechanisms that enhance the mechanical properties of materials caused by crystallization and aggregate formation processes.

最先进的高压技术允许合成纳米多晶材料，例如，陶瓷，具有优异的机械性能，例如高硬度和高断裂韧性，来自地球丰富的地质材料。许多陶瓷、金属和金刚石的晶粒细化和硬度的正相关性被称为Hall-Petch关系。这一点从硅镁石中也很明显，硅镁石是SiO2的高压多晶型物，被称为最硬的氧化物。纳米多晶硅镁石的韧性是单晶硅镁石的7倍。这说明晶粒细化不仅可以提高材料的硬度，而且可以提高材料的断裂韧性。因此，纳米多晶地质材料具有很大的潜力来替代经济的关键金属原料，这些原料对于生产具有增强机械性能的普通材料至关重要。特别是纳米多晶岩土材料在创造兼具高硬度和高断裂韧性的联合收割机材料方面非常有前途，这是迄今为止材料科学的一个巨大挑战。拟议项目的目的是采用最先进的高压高温技术合成具有优异机械性能的经济非关键材料，这些材料由具有可控纹理的纳米多晶地质材料复合材料制成。计划从Al 2 O3-SiO2玻璃中合成具有可变摩尔Al 2 O3：SiO2比例的Al 2 O3（Al 2 O3）和斯石英（SiO2）的纳米多晶聚集体，以及从MgAl 2 O 4玻璃中合成方镁石（MgO）和MgO的纳米多晶聚集体，以及从NaAlSi 3 O 8玻璃中分别合成硬玉（NaAlSi 2 O 6）和SiO2-高压矿物斯石英和柯石英的纳米多晶聚集体。这种系统的实验方法的另一个重要目标是更好地了解结晶和聚集体形成过程引起的材料的机械性能的基本机制。

项目成果

Thermal expansion and P-V-T equation of state of cubic silicon nitride

立方氮化硅的热膨胀及P-V-T状态方程

• DOI: 10.1016/j.jeurceramsoc.2019.05.003
• 发表时间: 2019
• 期刊: Journal of the European Ceramic Society
• 影响因子: 5.7
• 作者: Nishiyama N;Fujii K;Kulik E;Shiraiwa M;Gaida NA;Higo Y;Tange Y;Holzheid A;Yashima M;Wakai F
• 通讯作者: Wakai F

Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite and Al2O3 corundum

• DOI: 10.1111/jace.15281
• 发表时间: 2018-03
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: N. A. Gaida;N. Nishiyama;A. Masuno;U. Schürmann;Christopher Giehl;Oliver Beermann;H. Ohfuji;J. Bednarčík;E. Kulik;A. Holzheid;T. Irifune;L. Kienle